Have seen not too long ago, a hunting spider and dragzhar one by each other, I could swear they cooperated too.

Was also interesting to see umberhulks "herding" rothe.

Goblins, deep lizards and kobolds seems to work the same too.

alogen Have seen not too long ago, a hunting spider and dragzhar one by each other, I could swear they cooperated too.

I've seen it too. At the Gate road.

https://efupw.com/efu1-forum/topic/20/20845/npcs-hearing-us/index.html#post-79617

It happens because we don't have separate factions for every single type of monster.

Anyhow, this isn't really a bug that's going to be fixed. Locking.